Gun elevation control device



33-235- XR 3s2895'%4 5R DeC- 6, 1966 H. BECKER ETAL 3,289,534

GUN ELEVATION CONTROL DEVICE Filed May 19, 1964 2 sheets-sheet 1 CAM &F/.LDWER Dec. 6, 1966 H. BECKER ETAL 3,289,534

GUN ELEVATION CONTROL DEVICE y Filed May 19. 1964 2 Sheets-Sheet 2United States Patent Ofice 3,289,534 Patented Dec. 6, 1966 3,289,534 GUNELEVATION CONTROL DEVICE Helmut Becker and Helmuth Frenk, Wetzlar, andHorst Schmidt, Nauborn, Kreis Wetzlar, Germany, assignors to Ernst LeitzG.m.b.H. Wetzlar, Wetzlar, Germany, a corporation of Germany Filed May19, 1964, Ser. No. 368,580

Claims priority, appiication Germany, May 22, 1963,

S Claims. (Cl. 89--41) The present invention relates to a device foradjusting the elevation of guns. The invention rel-ates particularly toan adjusting device of such nature in which an optical gun sightinstrument is operatively connected to the gun barrel.

Combinations of optical gun sights and gun barrels are already known.The known devices usually comprise a gun sight coupled, for example,`aiiixed to the gun barrel so that pivoting of the gun sight about ahorizontal axis is transmitted to the gun at a 1:1 ratio for pivoting ofthe gun barrel. In order to consider the ballistic correction anglerequired to impart and determine the correct trajectory for theprojectile, an `additional elevation angle adjustment is required. Theknown devices adjust the gun barrel after the distance to the target hasbeen determined. Usually the gun sight is provided with marker plateshaving a number of different markers each being associated with aparticular distance. The gun lbarrel and the gun sight are then beingadjusted together and -by an angle required to have the target as viewedthrough the gun sight register with the particular marker associatedwith the specific distance of the target. Thereby the ballisticcorrection is imparted upon the gun barrel.

It is a disadvantage `of this particular arrangement that the adjustmentis true and correct only for one particular type of projectile. If adifferent type of projectile is being used a different marker plate hasto be inserted.

Another type of known devices operates with a lixedly positioned gunsight, but there is a pivotable mirror in the gun sight which isadjusted for determining the line of sight. When the mirror rotates theelevation of the gun barrel is adjusted accordingly. In both cases,however, there is the disadvantage that the measurement of the distanceand the adjustment of the additional ballistic angles are two entirelydifferent operation steps.

It is an object of the present invention to overcome the aforementioneddeficiencies by operatively coupling range finding and ballisticadjustment of the gun barrel.

According to one aspect of the present invention in the preferredembodiment thereof, it is suggested to first employ a gun sight whichincludes a variable optical element to determine the direction of theline of sight as between gun and target, and coupling means areinterposed between the gun sight and a gun barrel, to adjust theelevation of the gun barrel in accordance with the line of sightadjustment as furnished by said variable optical element.

As an adjustable optical element one can employ a plane mirror pivotallypositioned at the object side of the gun sight and being operativelycoupled to the gun barrel for adjusting the elevation of the gun barrelto the direction of the line of sight as determined by the adjustment ofthis mirror with respect to the stationary gun sight optic, and asoptically detectable by the position of the image of the target relativeto a reference marker positioned in the image plane of the eyepiecepertaining to the gun sight.

Next, it is suggested to employ a range finder which upon adjustmentfurnishes an adjusting value that is representative of the distancebetween gun and target, and this adjusting value is used directly toalter the adjusted relation between the gun barrel, on the one hand, andthe line of sight and target image adjustment as visible in the gunsight in relation to the reference marker on the other hand. The rangefinder adjustment value may either be transmitted directly for adjustingthe elevation of the gun barrel so as to provide for the ballisticcorrection thereof. Alternatively, the range finder adjustment may befed into the gun sight in that a second adjustable optical element inthe gun sight varies the relative position of target image and referencemarker. Upon so infiuencing the gun sight, the latter requiresreadjustment thereof, and the adjustment of the ldirection findingoptical element of the gun sight is then additionally transmitted to thegun barrel to impart thereon the required ballistic correction.

In a preferred embodiment it is possible to structurally and opticallycombine the gun sight and the range finder. The gun sight optic may thenincorporate variable means to constitute a range finder, and theadjustment of the range finder is either directly transmitted to the gunbarrel for providing thereto the ballistic elevational correction, orthe range finder adjusting means may influence -a reference marker inthe range finder-gun sight which is adjustable perpendicularly to theoptical axis of the gun sight-range finder. The adjustment of thisreference marker in response to the range finder adjustment requiresreadjustment of the direction finding element of the gun sight wherebyadditionally the ballistics correction is imparted upon the gun barrel.If a gun sight is provided with a pivotable target searching mirror aswell as with a fixed marker in the image plane of the eyepiece, theballistic angle may be transmitted from the range finder to the gunbarrel via a differential gear which ar- -ditionally is driven by themirror of the gun sight when adjusted. Preferably, a vario optic isbeing used for range finding which vario optic is incorporated in thegun sight. The adjusting knob or handle for the range finder isoperatively coupled, for example, by means of a rope to `a transmissiondevice which determines the Iballistic angle necessary and correspondingto the degree of adjustment required for increasing or decreasing themagnification of the target image to a fixed standard. This transmissionof magnification adjustment to gun elevation is preferably carn'ed outby means of a carriage having an adjustable follower curvatureconsidering the ballistics of the projectile. The azimuth angle can beadjusted additionally.

While the specification concludes with claims particularly pointing outand distinctly claiming the subject matter which is regarded as theinvention, it is believed that the invention, the objects and featuresof the invention, and further objects, features and advantages thereofwill be `better understood lfrom the following description taken inconnection with the accompanying drawing in which:

FIGURE la illustrates somewhat schematically in perspective andpartially exploded view the coupling of a gun barrel to the princi-paladjusting element of a gun sight as well as to the transmission elementoperated by a range finder;

FIGURE lb illustrates somewhat schematically the optical path of acombined range finder and gun sight with adjustable direction finder andvario optic including a somewhat schematical illustration of theadjustment elements of the range finder including the transmissionelement shown in FIGURE la;

FIGURE 1c illustrates the reference marker employed in the gun sightshown in FIGURE 1b;

FIGURE 2a illustrates somewhat schematically and in perspective view thecoupling of a gun sight and gun barrel in a second embodiment of theinvention;

FIGURE 2b illustrates schematically another embodiment of the inventionwherein the vario optic is coupled to influence the line of sightadjustment of the gun sight which is structurally incorporated in therange finder; and

FIGURE 2c illustrates schematically a front view of a reference markeremployed in the embodiment shown in FIGURE 2b.

`Proceeding now to the detailed description of the drawings, andparticularly FIGURES la and 1b thereof, there are shown specifically inFIGURE 1b, optical elements constituting a combined range finder and gunsight. The gun sight comprises an objective lens 1 which is stationarilymounted. On the object side of this objective lens 1 there is provided aplane mirror 3 which is pivotable `by a shaft 2 which extendstransversely to the optical axis of objective 1. Actually, the axis ofshaft 2 is truly horizontal and the optical axis of objective 1 extendsvertically. The mirror 3 is positioned to reflect incoming rays, i.e.,rays from the target into the range of objective 1.

Two mirrors 4 and S further reflect the rays coming from the objectivelens 1 for directing them through a field lens 1a. The light rays fromeld lens 1a then enter an intermediate optical system 6 comprised of anoptical negative member 7 and of an optical positive member S. In orderto adjust and to vary the magnification of the gun sight, the twomembers 7 and 8 are adjustable relative to each other and in thedirection of their common optical axis. These elements thus provide forthe structural combination of gun sight and range finder. For purposesof such adjustment the members 7 and 8 are suitably mounted, andpreferably, they are axially shiftable by means of an adjustment knob 9.The knob 9 may comprise a rotatable dial which includes a scale 10cooperation with a stationary marker 10a for indicating correctivevalues, for example, lateral ballistic correction angles.

The light rays leaving the intermediate system 6 through the adjustablemember 8 are being deflected by a prism 11 by 90, directing the imagingrays into a dove prism 12 for image erection. The erected imaging raysare then passed on to another positive member 13 which can be regardedas pertaining to the intermediate system 6 but this lens 13 isstationary. Another prism 14 then directs the light through a stationarymarker plate or grating 15 and to the eyepiece 15a. The plate 15' ispositioned in the virtual image plane of eyepiece 15a so that plate andtarget image are visible in the field of view of the eyepiece insuperimposed relationship. The marker plate 15 is illustrated in detailin FIGURE 1c, and it includes a contrast producing contour line 16 whichoutlines roughly the shape of the target in a representative image size.

Referring now specifically to FIGURE la, there is shown again the mirror3 mounted at the end of shaft 2 for pivot motion therewith. A gear wheel17 is secured to the shaft 2 and a suitable schematically illustrateddriving or adjusting mechanism may rotate this gear wheel 17 therebypivoting the mirror 3. Mirror 3 and shaft 2 may also be adjustedmanually by direct manual control of wheel 17. The rotary motion ofwheel 17 and of mirror 3 is imparted additionally upon a differentialgear 21 illustrated in exploded view and comprising a driving sun wheel18, planet wheels 20, and a driven sun wheel19.

The sun wheel 19 is mounted on a shaft 24, and the rotary motionimparted upon this sun wheel 19 is transmitted to an electromechanicaltransmission gear or servo gearing mechanism 25 which operates as apower amplier so that a high powered or high torque rotary motion isimparted upon shaft 22 supporting the gun barrel 23. Accordingly, anyrotary motion imparted'upon the sun Wheel 19 is transmitted as a highpowered pivot motion to adjust the elevation of gun barrel 23.

The mirror shaft 2 drives the two planet wheels 2t). The sun wheel 18 isseated on shaft 2, but it is freely rotatable relative thereto. The endof a control lever 26 is secured to the sun wheel 18. The free lever armof control lever 26 is provided with a pivot roller or pinion 27 bearingagainst a control member 28 operating as a cam. The control member 28 issupported by two rotatable cam disks 30 and 31. The cam disks 3i) and 31themselves are rotatably mounted on `a carriage 29. A Spring 32 issecured with one end to a suitably provided lug pertaining to carriage29, and with the other end the spring 32 engages a similar lug incontrol member 28 to urge the control member 28 intro engagement withboth cam disks 39 and 31.

The contour of the cam disks 30 and 31 can readily be derived from thedrawing, and it is apparent that by rotating one or both of the camdisks 3i) and 31, the inclination of control member 38 is madeadjustable. This adjustment occurs relative to the carriage 29 andparticularly to the sliding plane 33 thereof.

The carriage 29 can be guided along the sliding plane 33 against thetension of the spring 29a by means of a rope 34 which runs over guidepulleys 35 and can be wound upon a bobbin 9a pertaining to dial 9.Accordingly, upon adjustment of dial 9 the effective length of the rope34 can be varied, and thereby the carriage 29 is being moved; in thedrawing movement is to the left and against the tension of spring 29a,or upon reversal of the dial movement, the spring 29a can causeretraction of the carriage 29 towards the right. The carriage movementis imparted upon the lever 26 as pivot motion around the axis of shaft2, and the slope of control member 2S determines the ratio betweencarriage movement and pivot angle of control lever 26.

The device as described thus far operates as follows: First, the mirror3 is being adjusted by imparting a rotary motion upon the gear wheel 17,until the target image appears in the observation field and centrallyrelative to contour 16 so that it can be seen through the eyepiece 15a.The relative position of mirror 3 now defines the direction of the lineof sight between gun and target. The differential gear 21 operates fortransmitting this relative position of mirror 3 and the pivot motion ofshaft 2 at a ratio of 1:2 upon shaft 24, and the power amplifying device25 transmits this adjustment motion upon shaft Z2 for an initialadjustment of elevation of the gun 23. After adjustment, the gun pointsdirectly at the target. It is assumed that the transmission ratio asbetween shafts 24 and 22 is 1:1. Thus, the initial adjustment of the gunis carried out concurrently with thc initial adjustment of the mirror 3until the target appears visible in the eyepiece 15a.

The reason for the 1:2 ratio by the differential gear 21 is to be seenin the following. Assuming that the target is straight ahead, the mirror3 will have to be adjusted to a position which is exactly 45 to thehorizontal or the vertical. ln this case the gun barrel 23 has aposition to point in a straight horizontal direction. For a targetalmost straight up, the mirror 3 has to be adjusted by not quite 45 andalmost in a vertically extending plane in order to direct the image raysfrom the target into the gun sight for rendering the target visible.`Concurrently thereto, the gun barrel 23 will have to be adjusted byabout in order to be directed almost straight up. Thus, the adjustmentratio between mirror 3 on the one hand and the gun barrel on the otherhand must follow the ratio of 1:2.

The rules of ballistics have to be considered next in order to adjustthe elevation of the gun barrel 23 so that the projectile is launchedinto the correct trajectory. Two factors have to be considered. Onefactor is the ballistic characteristics of the bullet or projectileitself, and the other factor is distance between gun and target.

The characteristics of the projectile are being considered by adjustingthe cam disks 36 `and 31. By suitably Calibrating the disks 30 and 31,they can be adjusted to such a position so as to determine the specificinclination of the control member 23 in a manner characteristic of theprojectile. This adjustment by itself may or may not immediately imparta movement upon lever 26. VHowever, the variation in the inclination ofcontrol member 28 adjusts the transmission ratio of carriage movement onthe one hand and pivot angle of lever 26 on the other hand.

The carriage 29 is now being adjusted by actuation of dial 9. The degreeof ladjustment is determined by the change in magnification produced andneeded to have the target image match contour 16. When upon adjustmentof dial 9 the magnification of the gun sight is being adjusted, thedistance between the two members 7 and 8 of the variable optic is beingchanged until the tar-get image :as viewed through the eyepiece 15amatches precisely the contour 16. Of course, a prerequisite of thismeasure is t-o be seen that the natural size of the target itself isknown. However, this does not present any difficulties because thesesizes are in fact known, or at least portions are known so ias to permit.an estimate of actual overall size `of the target. Also, there may beprovided various contour lines or other size-identifying markers on theplate 15.

Upon adjusting the magnification of the gun sightrange iinder to theextent that the image of the target matches corresponding dimensions ofthe contour line 16, the rope 34 is being adjusted, and thecorresponding movement is being imparted upon the carriage 29. Thecontrol member 28 on carriage 29 ypivots the lever 26 by a particularan-gle, and wheel 18 follows this lever motion by rotating wheel 18 fora similar angle. The rotation is imparted upon the sun wheel 19 and toshaft 22 at a 1:2 ratio, so that the gun barrel 23 is now being adjustedfor the additional ballistic correction angle. For proper adjustment itis knovm that according to the rules of ballistics, normally the gunbarrel 23 must have ultimately a larger .angle relative to the verticalthe closer the target is.

Looking at FIGURE la, such larger angle or such adjustment towardslarger angle requires counterclockwise rotation of sun 'wheel 18,because the rotary motion of sun wheel 1S is being transmitted upon thesun wheel 19 via the planet wheels 20 in opposite directions. FromFIGURE 1b one can, therefore, see that counterclockwise movement of thedial 9 will move the carriage 29 to the Ileft resulting in acounterclockwise rotation of lever 26 and wheel 28 so as to increase theelevation of the gun. An adjustment of dial 9 in clockwise directioncauses the spring 29a to retract the carriage 29, whereupon the arm 26will pivot in clock'wise direction to respectively decrease theelevation of the gun barrel 23 as is correct for a closer target. Thevarious parts are machined and dimensioned so that the gun barrel 23 isbeing pivoted by an angle corresponding to the required ballisticcorrection whenever the image of the target matches the contour 16.

It can be seen further from FIGURE 1b that 4the adjusting knob 9 can beoperatively connected to another cam follower 39 -of suitable designwhich controls an azimuth `drive 39' for laterally adjusting the gunbarrel 23. In particular, -this azimuth drive 39 may be provided for anykind of lateral or azimuthal ballistic correction.

In this embodiment, the gun sight and the :range finder are structurallycombined, and they are functionally interrelated only insofar as thedirection finding characteristi-cs of the optical device facilitatesrange finding. The line Iof sight adjustment and the ballisticcorrection are independently imparted upon the gun barrel, but the gunbarrel is directly coupled to both the line of sight adjustment meansand the vario optic of the Vrange finder.

Proceeding now to the description of the second embodiment of thepresent invention which is illustrated in FIGURES 2a, 2b and 2c, thereare shown several elements which correspond to those illustrated inFIGURES la through 1c. In particular, the optical arrangement and thegun sight itself comprised of elements 1, 3, 4, 5, 1a, 7, 8, 11 to 14and 15a are the same as shown in FIG- URE 1b. However, instead of afixed marker plate 15 as shown in FIGURE 1b, there is shown in FIGURE 2band FIGURE 2c an adjustable marker plate 36. The marker plate 36 isguided in members 38 so as to be adjustable perpendicularly to theoptical axis of the eyepiece 15a. Marker plate 36 is guided in thedrawings in vertical direction. Furthermore, in this embodiment, thecarriage 29 is positioned so that the control member 28 supported bycarriage 29 bears against a roller 37 pertaining to a guide feeler ofmarker plate 36. An adjusting rope 42 is again provided for being woundpartially upon the bobbin 9a of dial 9. A guide pull-ey 39 directs thisrope 40 horizontally and towards carriage 29 which is spring biased `bymeans of the spring 29a, also as aforedescribed. Hence, in thisembodiment the carriage 29 and the control member 2S do not influencethe transmission of rotary motion as between mirror 3 and the gun barrel23, but they change the reference to the line of sight determined by thegun sight when the target image is in the center.

As shown in FIGURE 2a, the mirror 3 is of course adjustable and theadjustment movement required to direct the light rays from the targetinto the gun sight to appear as image in eyepiece 15a, is being carriedout here by the driving element 41 such as a gear or adjusting wheel.The rotary adjusting motion is being transmitted directly by a powertransmission arrangement that again provides for a 1:2 step up inangular transmission. The transmission device 42 is not illustrated indetail, and it can be of any -suitable design which is capable oftransmitting a rotary motion of relatively low power in a 1:2 ratio ashigh powered or high torque rotary movement upon the gun barrel 23 whichis not shown in this drawing, but the device is analogous tothat shownin FIG- URE la in this respect.

The device illustrated in this embodiment and particularly asillustrated in FIGURES 2b and 2c operates as follows: At first themirror 3 is bein-g adjusted in order to render the target visible ineyepiece 15a. Thereby, the gun barrel is adjusted to point towards thetarget along the line of sight, and this initial .adjustment movement isprecisely the same as described above. The cam disks 30 and 31 arebein-g adjusted either before or afterwards in order to accommodate thegun for the particular ballistic characteristics of the projectile used.Next, the magnification rratio of the gun sight is being adjusted byactuating the dial 9, and the vario optic 6 is being adjustedaccordingly. The adjustment of `dial 9 is transmitted upon the carriage29. Thus -this particular aspect is also similar to the aforedescribedembodiment in that the dial 9 directly adjusts the relative position ofthe control member 28 t-o the cam follower 37.

The horizontal carriage movement is transmitted as a vertical movementof marker plate 36 as scanned by feeler wheel 37. Of course, thetransmission ratio of horizontal carriage movement to vertical feelermovement depends upon the inclination of the control member 28 whichinclination was adjusted by the cam disks 30 and 31. When the size ofthe image of the target corresponds to the size Iof the contour 16, thecontour line 16 actually has been shifted up or down. The target imageis now misaligned in the optic as compared with the initial lineof-sightadjustment. In order to provide again for correct position of the targetimage, the mirror 3 has to be readjusted by lan additional angle anduntil the image of the target again matches and is directly superimposedupon contour line 16.

The adjustment of mirror 3 by means of adjusting device 41, of course,depends on the extent with which the marker plate 36 was movedvertically by the control member 28 when during adjustment of themagnification the dial 9 shifted the carriage 29. Again, the degree ofadjusting the marker plate 36 depends on the distance of the target fromthe gun, because the distance of the target is reliected upon the degreeof adjustment required for proper change in image magnification. Whennow by means of the adjusting device 41 the mirror 3 is being pivoted toput the image of the target back into contour matching relationship withthe contour line 16, the degree of mirror adjustment corresponds to therequired ballistic angle, and is transmitted upon the gun barrelaccordingly.

The marker plate 36 shown in FIGURE 2 shows an additional marker 16awhich in effect permits adjustment to a larger distance. The target sizeitself is the same, but the vertical distance between the contour line16 and the smaller contour line 16a corresponds to an adjustment angleof mirror 3 which compensates for the different degrees of magnificationadjustment necessary to have the target image match either contour line16 or contour line 16a.

The invention is not limited to the embodiments described above, but allchanges and modifications thereof and not constituting departures fromthe spirit and scope of the invention are intended to be covered by thefollowing claims.

What is claimed is:

1. A device for adjusting the elevation of a gun barrel comprising:

a stationary gun sight;

rst optical means adjustable for directing the viewing field of said gunsight into the line of sight as between gun and target;

an adjustable reference marker in said gun sight;

second adjustable optical means in said gun sight for providing anadjustment value representative of the distance between gun and targetthereby establishing a range finder;

first transmission means for operatively coupling said first opticalmeans to said gun barrel for correspondingly adjusting the elevationthereof in response to adjustment of said first optical means; and

second transmission means including a cam follower device coupled foradjustment to said range finder and operating upon a feeler means forcoupling said second adjustable optical element to said referencemarker, for shifting said reference marker upon said range finderadjustment and by a value corresponding to the ballistic trajectory andthe distance between gun and target.

2. In a device as set forth in claim 1. said cam follower including acarriage shifted in response to adjustment of said range finder andhaving a control member bearing against said feeling means fortransmitting thereto the shifting of said carriage as adjustingdisplacement,

3. A device as set forth in claim 2, said control member beingadjustable for varying the ratio as between carriage shifting auddisplacement of said member in accordance with a desired projectiletrajectory.

4. A device as set forth in claim 2, said control member defining a camfollower surface bearing against said feeler means, there being twoadjusting elements for angularly adjusting said control surface relativeto the direction of shifting of said carriage.

5. A device for adjusting the elevation of gun barrels, comprising:

a stationary optical gun sight including optical reference means andadjustable optical means for adjusting the direction of the line ofsight and of the viewing field between gun sight and target as observedby said gun sight and in relation to said reference means;

transmission means for transmitting said adjustment of said opticalmeans as elevational adjustment upon said gun barrel;

adjustable range finder means for providing an adjustment valuerepresentative of the distance between gun and target; and means forcoupling said range finder to said reference means so as to adjust saidreference means in response to adjustment of said range finder andrelative to the line of sight adjustment as adjusted by said opticaladjustment means for changing the adjustment relation between the lineof sight as detected relative to said reference means and the adjustmentof said gun barrel as corresponding to the adjustment of said firstoptical element. 6. A device for adjusting the elevation of gun barrels,comprising:

optical direction finder means for detecting the direction of the lineof sight as between gun and target and furnishing an adjusting valuerepresentative thereof; optical range finder means including a variooptic for determining the distance between gun and target and forproviding a second adjusting value representative thereof; means forvarying the relationship between vario optic `adjustment and said secondadjusting value in response to predeterminable ballistic trajectorycharacteristics; and means for varying the elevation of said gun barrelby a value which is representative of said first and said secondadjustment values. 7. A device for adjusting the elevation of a gunbarrel comprising:

an optical gun sight incorporating therein adjustable optical means forvariation of magnification so as to constitute a combined gun sight andrange finder; direction adjustable optical means optically coupled tosaid gun sight for directing the viewing field into the line of sightwith `a target; means for transmitting the adjustment of said opticalmeans as line of sight elevational adjustment to said gun barrel; andmeans coupled to said magnification adjustment means for providing anadditional corrective value corresponding to the ballistical correctionof the elevation of said gun barrel. 8. A device for adjusting theelevation of gun barrels, the combination comprising:

optical direction nder means for detecting the direction of the line ofsight as between gun and target; means operatively coupled to saiddirection finder means for adjusting elevation of gun barrel so as tocorrespond to the direction as detected by said direction finder means;optical range finder means for determining the distance between gun andtarget; transmission means for transmitting the range finder adjustmentas additional elevation upon said gun; and means for varying thetransmission ratio of said transmission means.

References Cited by the Examiner UNITED STATES PATENTS 2,385,348 9/1945Chafee 89-41 2,407,665 9/ 1946 Holschuh et al 23S-61.5 2,561,924 7/1951Hellen 2 88-12 2,609,606 9/1952 Draper et al 89-41 FOREIGN PATENTS217,351 9/1961 Austria.

OTHER REFERENCES German `application 1,089,185, Hopp, September 15,1960.

SAMUEL FEINBERG, Primary Examiner.

FRED C. MATTERN, IR., BENJAMIN A. BORCHELT,

Examiners. W. C. ROCH, Assisla/zt Examiner.

7. A DEVICE FOR ADJUSTING THE ELEVATION OF A GUN BARREL COMPRISING: ANOPTICAL GUN SIGHT INCORPORATING THEREIN ADJUSTABLE OPTICAL MEANS FORVARIATION OF MAGNIFICATION SO AS TO CONSTITUTE A COMBINED BUN SIGHT ANDRANGE FINDER; DIRECTION ADJUSTABLE OPTICAL MEANS OPTICALLY COUPLED TOSAID GUN SIGHT FOR DIRECTING THE VIEWING FIELD INTO THE LINE OF SIGHTWITH A TARGET; MEANS FOR TRANSMITTING THE ADJUSTMENT OF SAID OPTICAL